Your boss is your guide, judge, and advocate. Many times, the relationship between a consultant and supervisor determines whether an employee is successful and increases value...or ultimately departs without leaving a mark. Here, the Insight Sourcing Group tops the list, upending Bain that tumbled to 5th. It is increasingly becoming a strength for BCG, which climbed from 6th to 2nd. The biggest change involved Eagle Hill Consulting, which fell from 4th to a still impressive 8th.